I am looking for the tests and inspection that are commonly specified when purchasing ball, gate, globe etc valves for any service (water, steam and other). Reviewing ANSI B16.34 it seems to require only pressure testing for all valves, and other NDT only for special rate valves. Am I right? If a valve is standard class only pressure test is required?
Moreover, I have found in Internet that other codes such as API 6D are more restrictive with the inspections required to valves. Could any tell me about its main differences with ANSI B 16.34?

Regarding NDE and and ASME B16.34
You are correct. NDE, either radiography or alternatively, if agreed to by the customer, ultrasound, is required only for special class valves.

Regarding test standards
The following valve standards all apply to testing, or at least cover testing among other topics (these are the ones I